Facebook wants to know as much about you as possible and tracks the things that you like. One reason it does this is to provide targeted ads. But do you ever wonder how much information Facebook actually knows about you? Now you can find out.

Facebook uses an algorithm to track its users so that it can come up customized ads, among other things. It keeps track if you click "like" on something you see on Facebook, or tag photos from specific locations and uses this information for marketing purposes. The way you describe yourself on your profile, the music you like and your relationship status are also used.

Facebook can also collect information about you when you're not on its site. They can see what you're looking at if you click the "like" buttons found on other sites. Facebook even gets information from other apps like Instagram and WhatsApp.

Facebook doesn't stop at just tracking its users for information. ProPublica says the social media company also buys data about its users' shopping habits, car ownership, and even mortgages from commercial data brokers. Facebook then sells all of the collected information to marketing groups who use it to target specific groups of people.